To Use Or Not To Use? - Flywheel

Discussion in 'Z32 Technical' started by Boll!, Jan 25, 2019.

  1. Boll!

    Boll! Active Member

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    Hi Guys.
    So i needed to replace my clutch, and once the clutch was out and i had inspected the flywheel, it seemed to be in pretty bad shape, some pretty ordinary looking heat marks and also cracks.
    So i put the feelers out to get a decant second hand replacement, which i got and bought site unseen.

    So, the pics speak for themselves, it looks like it may have been machined already quite a few times, or a lot at once, 2 out of the 3 balancing drill holes have been machined through and the third would do the same id imagine if it were to be machined again.
    Also, hard to see in the pic, a couple of "big"looking cracks.

    What are every ones thoughts?
    Anyone come across this before?

    When i showed it to the fella who has done some machine work for me in the past, He kinda screwed his nose up and said "OOhh well, yeah, not sure about that mate, totally up to you though"which didnt fill me with confidence lol

    Let me know what you all think.

    Cheers

    Col

    IMG_6479.JPG IMG_6480.JPG IMG_6481.JPG IMG_6479.JPG
     
  2. zx299

    zx299 Well-Known Member

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    I would bin it ! It's not worth the risk ....... imagine the damage a flywheel would do if it let go :eek:

    Why waste time and money machining (and fitting) a dodgy flywheel ?

    If your budget won't run to a new flywheel, don't settle for anything less than a fantastic condition used one.
     
  3. Boll!

    Boll! Active Member

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    I tend to agree with you, i guess i was hoping that the condition of the flywheel was better than what is is.

    Has anyone seen or heard of a 300zx flywheel failure?
     
  4. SRB-2NV

    SRB-2NV #TEAMROB

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    2nd hand flywheels are under $100 man.
     
  5. Shane001

    Shane001 Well-Known Member

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    The machining isn't the issue, provided it's been machined true, make sure you put a dial gauge on it.
    Cracks like that in the face - bin it!
     
  6. Boll!

    Boll! Active Member

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    Find me a good one under $100 delivered to me and I’ll buy it :):)
     
  7. Chrispy

    Chrispy Pretentious Upstart

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    Find a new one. If you've got the money the Jun ones are lovely.
     
  8. Boll!

    Boll! Active Member

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    What’s a new one worth? Can we buy locally?
    Buying anything grime the States at the moment is crazy expensive.

    Are the JUN chromoly? Lighter?
     
  9. rob260

    rob260 Moderator Staff Member

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    JUN are chrome moly and about 6.8kg from memory.

    I think I got @Chrispy in a group buy?

    I’ve never used a JUN moly fly but I had a horrible time with the combination Jim Berry clutch and extreme lightweight flywheel. The extreme one was much lighter than JUN and had a heap more holes in it but just had no integrity. Assuming you’re using the clutch I sold you that thing has a two ton clamp load (and yes I saw it tested when I bought it) -the lightweight flywheel was flexing under the pressure.

    Grab a new OEM flywheel; it’s what Jim told me to do originally and after finally making enough mistakes to take his advice I’d never fit a lightweight fly again. Especially with such a heavy duty clutch.

    But if you want a JUN one I’m happy to sell lol
     
  10. Boll!

    Boll! Active Member

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    Hi Rob.
    That clutch is “no longer with us” lol but I have another Jim Berry with the same specs as that, so yeah a shit load of clamp force.
    When I was talking with Jim on the phone about the dimise of that clutch in question ( I ended up having him rebuild it) he said to use OEM or a good quality chomoly flywheel.
    The only chromoly ones I can find are a lot lighter, around the 5.9 kg area, so not sure if they would be ok or not.

    What’s a new OEM one worth here in Aus?
     
  11. Chrispy

    Chrispy Pretentious Upstart

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    I was very happy with my Jun one with a heavy duty organic Exedy, and also with a brass button 5 puk. No worries with judder or slip. Pulled it out a few times and it was always in great condition. It's only a bit lighter than standard.

    I've driven a few with the superlight ally fly's and they were horrid to drive with.
     
  12. Boll!

    Boll! Active Member

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    Hi Chrispy
    Do you know what clamp pressure those clutches had?
     
  13. Chrispy

    Chrispy Pretentious Upstart

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    No idea. But had no issues with the V8 or the modded TT. Was a NA fly/clutch as well.
     
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  14. MikeZ32

    MikeZ32 das Über member

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    NA flywheel and a heavy duty single (same as R33 GTST) can handle 500HP without issues.

    I agree a used flywheel is probably $100. Try Jamie Cole.
     
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  15. East Coast Z

    East Coast Z Well-Known Member

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    Had a Jun flywheel, highly recommend these.
    What's it matter how much it costs?
    If you want a high quality item, spend the money.
     
  16. Boll!

    Boll! Active Member

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    I agree that generally you pay the price for a high quality item, and of coarse it matters how much it cost because i have a budget just like most people do.
    But why spent the money on a high ticket item, if you can get the same result at a cheaper price.
     
  17. Boll!

    Boll! Active Member

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    Out of curiosity, what’s can you sell a Jun flywheel for?
     
  18. ewschinzel

    ewschinzel Member

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    Location:
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    These are surface heat cracks, your clutch has been slipping....get it machined , cost around 60 to 100 dollars.
    Or if undecided get a new one...they are not expensive...around 200 to 250
     
  19. Boll!

    Boll! Active Member

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    Hi mate.
    Yeah it most definitely was slipping.
    I think they are too deep to machine out.

    Point me in the direction of a $200 new OEM and I’m on it :)
     
  20. Shane001

    Shane001 Well-Known Member

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    haha, me too :)
     

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